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Microscopic spray measurements of non-reacting alternative jet fuel: Effect of ambient gas temperature

机译：非反应替代喷射燃料的显微镜喷雾测量：环境气体温度的影响

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摘要

The volatile characteristics of alternative Gas-to-Liquid (GTL) jet fuel and conventional Jet A-1 fuel are significantly different due to their chemical composition variations. This difference can have a strong influence on the atomization performance at elevated ambient gas temperature conditions. Because the atomization process plays a vital role in fuel distribution inside the combustor, which ultimately affects heat release and emission patterns. The objective of the present work is to investigate the effects of ambient gas temperature and nozzle pressure differential on the non-reacting, microscopic spray performance of the alternative jet fuel using a pressure-swirl nozzle, and then, compare these effects to those of Jet A-1 fuel. Specifically, this study investigates the droplet size, velocity and distribution, by employing the Phase Doppler Anemometry technique to measure these parameters at several radial and axial locations downstream of the nozzle exit. The effect of ambient gas temperatures is studied at 300, 350, and 400 K at two nozzle pressure differentials, 300 and 900 kPa, while maintaining a constant ambient gas pressure and fuel temperature. Results show that, in the region investigated, there is a significant difference between the spray performances of GTL and Jet A-1 at elevated operating conditions. The outcomes of this study will add new knowledge to the limited scientific literature on the effect of ambient gas conditions on the local spray parameters of alternative jet fuel.
机译：由于其化学成分变化，替代气 - 液（GTL）喷射燃料和常规喷射A-1燃料的挥发性特性显着差异。这种差异可能对升高的环境气体温度条件下的雾化性能产生强烈影响。因为雾化过程在燃烧器内的燃料分布中起着至关重要的作用，所以最终影响热释放和发射图案。本作工作的目的是研究环境气体温度和喷嘴压差对使用压力 - 旋流喷嘴的替代喷射燃料的非反应，微观喷射性能的影响，然后将这些效果与喷射器的效果进行比较A-1燃料。具体地，本研究通过采用相位多普勒式水平测量技术来调查液滴尺寸，速度和分布在喷嘴出口下游的几个径向和轴向位置处测量这些参数。在两个喷嘴压差，300和900kPa的300,350和400k下研究环境气体温度的影响，同时保持恒定的环境气体压力和燃料温度。结果表明，在研究区域，GTL和喷射A-1在升高的操作条件下存在显着差异。本研究的结果将在有限的科学文献中为环境气体条件对替代喷射燃料的局部喷雾参数的影响增加新知识。

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